Method of producing prints in black and a single color and the resulting product



May 18,1926. 1,585,388

F. E. IVES ET AL METHOD OF PRODUCING PRINTS IN BLACK AND A SINGLE COLORAND THE RESULTING PRODUCT Filed Oct. 12, 1923 LIGHT SENSITIVE EMULSIONLATENT IMAGE m I LIGHT smsmvz J l/d5 //A EMULSION D EVELOPED IMAGEHARDEN ED DEVELOPED IMAGE TRANSPARENT RED MATERIAL R: COLORING MATTER NVTZ TRANSPARENT GREEN 67 I COLORING MATTER BY Q ay n E M I TRANSPARENT II Patented May 18, 1926.

UNITED STATES PATENT OFFICE.

FREDERIC EUGENE IVES, OF PHILADELPHIA, PENNSYLVANIA, AND JACOB I. LEVEN-THAI, OF NEW YORK, N. Y.

METHOD OF PRODUCING PRINTS .IN BLACK AND A SINGLE COLOR AND THE RESULT-ING PRODUCT.

Application filed October 12, 1923. Serial No. 668,042.

Our invention comprehends a novel method of producing prints in' blackand a single color and the resulting product.

A black and single color print is one in 6 which a subject is reproducedas an ordinary photographic monochrome with the exception that the areasthat were of sub stantially a single desired color are reproduced insubstantially that color in the finished product. While we contemplatemaking red the color to be reproduced, we do not limit our invention tothe use of that color,

nor do we mean, by the term red only the actual reds of the subject..While in the finished print all the colored areas will be ofsubstantially the same color, though of different. intensities, theareas in the subject might have ranged from orange to'deep red.

It will be obvious to those skilled in the art that two negative recordswill be re quired, which records, though geometrically alike, must havecertain color recording differences.

In a previous application filed by Jacob F. Levcnthal, on August 6,1923, Serial No. 655,923, it is stated that a special negative called aspot negative, which is a record of only the areas that are to becolored in the finished print, is necessary, and methods were describedfor producing the said spot negative.

One of the objects of the present invention is to get the desired resultwithout making a spot ne ative but by working from the two originanegative records made directly from the subject.

For the purpose of illustrating our invention, we have shown in theaccompanying drawings a typical embodiment thereof which is at presentpreferred by us, since this embodiment will be found 1n practice to givesatisfactory and reliable results, although it is to be understood thatthe various instrumentalities of which our invention consists can bevariously arranged and organized and that our invention is not limitedto the precise arrangement and organization of these instrumentalitiesas herein shown and described. V

Figure 1 represents, schematically, the subject which is to bereproduced according to our method.

in cross section, a

Figure 10 represents a key to the cross sectioning.

Similar numerals of reference indicate corresponding parts.

Referring to the drawin s,

In carrying out our nove method, we produce by the action of li 'ht onphotographic emulsions containing, or example, silver salts, twogeometrically alike and registrable negative images of a given subject,either simultaneously or successively, as may be desired, and developand fix them in the usual manner.-

One image is'recorded by rays of substantially the collor desired in thefinished result, such as orange to red, and the other is recorded byrays other than the said desired rays, such as the green rays. Theimportant point here is that one is made exclusively y the oran e tored, while the other .is made by any or all rays but the orange to red.

Assuming that the colordesired in the finished print is substantiallyorange to red, the two negatives are made, one by orange to red lightand the other by say green light. They are developed and fixed in theusual way.

A print is now made in the usual photographic manner from the red recordwhich print is developed but not fixed. It is then immersed in a baththat will act on the image sot-hat it will not be affected by a latercolormg process.

The next step is to print from the green record negative on the samearea that was already exposed to the red negative, it being necessary tofirst bring the geometrically alike positive and negative records intoac-. curate registry.

The exposure having been made, the 8 and 9, consequently no image isrecorded at print is developed a second time, and it will these pointsand the areas 23 and 24 remain be found that substantially no record hasunaffected. been made except at the orange to red areas, In Figure 5,the print 16 is shown as the positive and negative records havingdeveloped but not fixed. The portions 23 combined to form amask exceptat those and 24 are consequently still sensitive to areas. We then fixin the usual way. light.

It nowremains simply to color the image The next step is to treat thedeveloped that was not previously treated against such image in theportions 21 and 22 in such a coloring, way as to harden it, or in otherWays pre- For the purpose of illustration only, we vent it from beingaffected by a subsequent have shown schematically in Figure 1 a dyeingprocess. subject 1 having a portion 2 which has This may be accomplishedby immersing orange to red color, a portion 3 which is tl1e unfixedprint in the following solution white, a portion 4 which is green and apor- (Water 11 litres, potassium bromide 227 tion 5 which is black.

lln Figures 2-and 3, we have shown developed and fixed negatives 6 and7, which are provided with portions 8, 9,10, 11 and 12.

grams, potassium bichromate 114 grams.

In Figure 6, this hardening effect is shown diagrammatically by theheavy line 25.

At Figure 7, we have shown the green 13, 14, 15, respectively, corresending to negative 7 in cross section as consisting of the portions 2,3, 4, 5 of the su ject 1, the a carrier 26 on which is the coating 27con- .negative 6 being a record of the subject 1 taining the imageportions 13 and 14. ltn

made by orange to red rays and the negaregistered contact with it hasbeen placed tive 7 being a record of the subject 1 made the unfixedprint 16. By passing light by green rays. While the two negatives arethrough the negative 7 we obtain a latent geometrically alike, certaindifferences are image at 24. apparent. In the red negative 6, the redThe areas 23,21 and 22, being in registered portion 2 of the subject 1has been recorded, contact with the areas 13, 14 and 15, it will asshown at 8, but in the green negative 7, be seen that light does not actin the areas the portion has not been recorded, as shown 23, 21 and 22.at 12. The white portion 3 of the subject The print 16 may now bedeveloped and 1 has afiected both negatives substantially fixed and isso shown at Figure 8. alike, since white contains both red -and Theprint is now ready for the coloring green rays and this is indicated inthe red process and inasmuch as the areas 21 and 22 negative 6, atportion 9, and in the green will not be afi'ected, due to the treatmentnegative 7 at portion 13. The green portion mentioned heretofore, it ispossible to change 4 of the subject has not afiected the red thedeveloped image 24 to a transparent red negative 6, as shown at 10, buthas aiiected color and leave the portions 21 and 22 unthe green negative7, as shown at 14. The colored. black portion 5 of the subject has ofcourse For this purpose we may proceed as folaft'ected neither of thenegatives, as shown at lows 11 and 15. First, we immerse in acopper-toning bath The next step is to make a print from the which is anequal mixture of the two solured negative 6. At Figure 4, we have showntions A and B. it in cross section in contact with a suitable lightsensitive material and carrier 16.

The negative6 appears in cross section as consisting of a transparentcarrier 1'7 on which is the coating 18 containing the image portions 8and 9. The photographic material 16 consists of a carrier 19 on which iscoated the light sensitive emulsion 20.

While the two emulsion surfaces are shown in contact, this is not anecessary feature, as it may be necessary, in some cases, to have anemulsion surface in contact with a carrier surface or even to have twocar- Cupric sulphate 7 grams, potassium citrate (neutral) 28 grams,water 1000 ccs.

Potassium ferricyanide 6 grams, potassium citrate (neutral) 28 grams,water 1000 ccs.

Then dye in the following solution:

Phenosafi'ranine, one part in 2,000 of water with a few drops of aceticacid.

The finished result is shown at Figure 9 light is prevented from passingthrough at rier surfaces-in contact, depending on the in which theportion 24 is now of a transmethod employed in forming the negatives,parent red color. Upon viewingby transand also prints can be made byprojection mitted light, the area 24 which was red in instead of bycontact. the subject 1, is seen as red, the area 23,

By passing light through the negative 6, which was white, is seen aswhite, the area We record a latent image of the transparent 21 which wasgreen is seen as black and the areas 10 and 11. as shown at 21 and 22.The area 22, which was black, is seen as black. While the negativerecords 6 and 7 are shown as separate pieces, this is by no means arequlrement 1n the carrying out of our process. By printing-on anemulsion sensitive to red and green light, the two records may beseparately printed from the red record by using green light and thegreen record by using red light. The procedure would otherwise be thesame as described for the negatives 6 and 7.

While no mention is made of the use of our process for cinematographicwork, we desire to have it understood that nothing herein contained isto prevent us from so doing, since a cinematographic film would simplybe a plurality of the single images shown in the drawings.

Having thus described our invention what we claim as newand desire tosecure by Letters Patent 1 1. A' process in photography, which consistsin first producing two geometrically alike photographic negative recordtransparencies of a subject, one being made by the action of rays from acertain desired part of the spectrum, the other being made by rays fromother than said desired part, then re cording in a light sensitiveemulsion a positive image from the negative record transparency whichwas made by the rays from said desired part of the spectrum, by passinglight through said transparency to said light sensitive emulsion, thendeveloping the resulting image but not fixing it, then treating thedeveloped image so that it will not be affected by a subsequent coloringprocess, then bringing into registry with the positive image soproduced,the other geometrically alike negative-record transparency, then passinglight through the said transparency to the emulsion containing thepositive image, this exposure being made on the same face as the otherwas,then develop ing and fixing the resulting image and then coloringwith a process that will substitute coloring matter for the developedimageforming material produced by the -second printing and developingbut will leave uncolored the developed image produced by the firstprinting and developing. 2. A process in photography, which consists inrecordingvin a li'ght'sensitive emulsion a positive image from anegative-record transparency, by passing light through said transparencyto said'light sensitive emulsion, then developing the resulting imagebut not fixing it, then treating the developed image so that it will notbe affected by a subsequent coloring process, then recording in theunexposed portions thereof another image from a differentnegative-record transparency by passing light rays to it through saidtransparency, this exposure being madeon the same face as the other was,

then developing and fixing the resulting recording, in a light sensitiveemulsion a positive image from the negative record transparency made bythe rays from the said desired. part of the spectrum by passing lightthrough the said negative transparency to the said light sensitiveemulsion, then developing the resulting image but not fixing it, andusing the resulting image as a mask, so that when the othernegative-record transparency is registered with it, the combination ofthe said negative-record transparency and the positive just producedwill substantially prevent light from acting except at those portionsthat were of substantially the same color, in the subject, as isrepresented by the desired part of the spectrum heretofore mentioned,the said portions bein recorded in the hitherto unexposed portions ofthe light-sensitive emulsion.

4. An article of manufacture, which consists of a single colloid coatingon a transparent carrier, containing in combination on the same face ablack lmage and another image of which vthe black lmage has beenrendered inert to the rooessing by which the other image-was co ored.

FREDERIC EUGENE IVES. JACOB 'F. LEVENTHAL

